Helpppp!!

Ladies, I need some advice. So end of April, I inseminated and right on time my period came for the month of may. I have very heavy periods, and nothing was different this time and a negative test. Except this month I realized my period was 9 days late. I took a test and it is positive. I did not insemnate this cycle so there’s now way I could be pregnant… I’m so confused?